Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Experimental Ponds"”.
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Ecology of benthic macroinvertebrates in experimental ponds
… 15 biological metrics in a series of 6 replicate experimental ponds from March 1989 to April 1990. I determined voltinism, emergence patterns, larval growth rates and annual production for Caenis amica (Ephemeroptera: Caenidae), Callibaetis floridanus (Ephemeroptera: Baetidae), Anax junius …
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Macroinvertebrate colonization and production in new experimental ponds
… macroinvertebrate colonization of twelve 0.04-ha experimental ponds was studied for the 1st yr of their existence. The ponds were filled in late January 1988, and artificial substrate samples were retrieved at 4-wk intervals from February 25, 1988 to February 25, 1989. The first organisms …
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Phytoplankton colonization and seasonal succession in new experimental ponds
… for pesticide registration tests, 12 experimental ponds were constructed in Blackstone, VA at VPI&SU Southern Piedmont Agricultural Experiment Station. Colonization and succession of the ponds’ phytoplankton communities were investigated during the first year after filling. Taxa …
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Structure and function of zooplankton colonization in twelve new experimental ponds
… development of zooplankton communities in 12 new experimental ponds for one year and tested four predictions derived from the Random Placement Hypothesis (Coleman 1981). Physico-chemistry, zooplankton colonization dynamics, zooplankton community structure and function were analyzed every two weeks …
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Non-Native Leaf Litter Modifies Algal Resources with Effects on Tadpole Growth
… block experiment that lasted 288 days. In experimental ponds, I added two non-native and two native leaf litter species in the presence and absence of tadpoles. Early in the experiment, Japanese honeysuckle and Chinese privet decreased periphyton N:P ratios and stimulated tadpole growth …
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Fathead Minnows, Aquatic Invertebrates, and Mallard Duckling Interactions in Man-Made Ponds
… and vertically oriented activity traps in experimental ponds in 1990 to test trap orientation effectiveness. Horizontal traps caught the most invertebrates, vertical traps caught more Coenagrionidae. Fathead minnows have the potential to affect invertebrate populations in wetlands. Stocking …
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Amphibians in a changing world: assessing the effects of warming and drying on amphibian larvae and the relationships between larval survival, body size, and time to metamorphosis
… to simulated warming and drying in experimental ponds. Over 13 weeks, we manipulated temperature and water levels in ponds to produce 4 treatments: control, drying, warming, and drying + warming. Our manipulations created warming treatments that were on average 2 ° C higher than …
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Effects of the aquatic to terrestrial habitat ratio on an amphibian predator and its prey
… <italic>A. maculatum</italic> in large-scale experimental ponds. These prey species have very different longevities, and therefore differential use of the aquatic and terrestrial habitats. Population-level results suggest that, as expected, <italic>A. maculatum</italic> had a larger influence …
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Competitive interactions and community influences among invasive and native fishes at different spatial scales
… for bluegill with bighead carp in 0.4-hectare experimental ponds. With increased environmental complexity and niche opportunities, my results from the pond experiment differed from the mesocosm experiment, as bluegill were found to benefit from bighead carp presence. Plausible explanations for …
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Managing the acidity of abandoned water filled coal mining voids in Collie (Western Australia) using organic matter
… and mulch had on mine void water in 18 in situ ponds constructed adjacent to Ewington. It was concluded from the laboratory experiments that mulch and manure treatments were significantly better than hay as an organic matter addition for increasing the pH of acidified mine void water at …
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Modelling and empirical approaches for predicting the invasiveness of alien species.
… native fish, with aquaria experiments and experimental ponds predicting that the global invader will substantially impact the trophic ecology of the native species (trophic niche shifts, niche expansion), with the patterns detected in the controlled environments matching those detected in …
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Juvenile crappie growth and bioenergetics: implications for management using blacknose crappie
… black, white, and blacknose crappies in both experimental ponds and the laboratory. In a common garden pond experiment, I found no differences in survival among strains or ponds. Blacknose crappie outgrew black and white crappies in both length and weight and black crappie outgrew white …
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The mechanisms behind alternative community states: Understanding producer composition in temporary and semipermanent wetlands
… the three variables in enclosures in two experimental ponds with floating and submerged plants. I found N supply rates drove these patterns more strongly than P and N:P. However, submerged plant composition and pH levels also affected floating plant responses. Finally, I evaluated the role …
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Yellow Perch Production and Harvest Strategies for Semi-Permanent Wetlands in Eastern South Dakota
… prey availability, and yellow perch growth in experimental and control ponds. Fertilization increased nitrogen levels and stimulated primary production in experimental ponds. However, effects of fertilizer application on zooplankton and benthic invertebrate abundances were minimal. Yellow perch …
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Effects of diversity on community assembly dynamics in newly formed pond communities
Theory suggests that the initial level of genetic or species diversity in a new habitat will influence community assembly dynamics. Previous studies have shown that species diverse communities can buffer against invasion by heterospecifics. In addition, the monopolization hypothesis predicts that a …